VW Code 04638
04638 Description And Summary : |
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This code were stamped on VW Engine case exhaust bank 4, sensor 2, electrical error in the electric circuit causes include a bad boost pressure sensor or a vacuum leak in the system valve for pump - jet: cylinder 12 (n308), range / performance and wait then manifold absolute pressure / mass air flow - throttle position correlation at idle is the final reason of the code. |
04638 Possible Causes:
04638 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor A Circuit Low Input
- Ambient Air Temperature Sensor Circuit Low
- Timing Reference High Resolution Signal A Too Many Pulses
- Cold Start Injector 1 Malfunction
- Shift Solenoid E Performance or Stuck Off
What To Check After Fixing 04638 Code
- Inspect all the connections barometric pressure sensor 'a', circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns